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You are correct, there is a VTEC solenoid on the side of the head that can get dirty and stop VTEC from engaging, this solenoid is known to outright fail too. If the cam sensor or knock sensor (or just about any other sensor) fails then it will generally throw a code. Does your check engine light ever come on?

The tacho itself is given signal directly from the ignition control module. If the ICM is faulty then that can cause a whole host of other issues too.